Anaconda should give you a list with checkboxes. If you know what the manufacturers are of the three disks or the size if all are different sizes, or both you can tell which on you want. Leave it checkmarked and uncheck the other two.
I did my installs over the internet from the Fedora server or mirror (mirror I think).
click on all mirrors (your will be fedora-intel instead of ppc)
from the mirror list filter choose the fedora you want in the architecture you need and click on that.
I used Oregon State, because I've used them before with fine results
I'm betting you have an EFI machine
you download what you need from there and
what you need from here.
From this point on I can't help you with putting this stuff on your computer. On mine from the ppc link I stick on that on my root area of one of my drives and boot up open firmware, which I bet you can't do either and then from there boot into the anaconda installer.
The Anaconda installer then asks me if I want to use an URL, or a DVD or network if you by chance have it on another computer. I choose the url, punch in my ip address, netmask, dns numbers where it asks for them. Like setting up a router.
Same number sets.
Then I type in this address (cause that is what I have written down in my notebook, more than anything else):
mirror.aarnet.edu.au/pub/fedora/linux/releases/12/Fedora/ppc/os and hit enter. Yours should differ slightly, You prabably want i386/os instead of ppc/os
If I explained this all right it should bring up a gui installer program. And away you go!